Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

41. 

In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.

A. True
B. False

Answer: Option B

Explanation:

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42. 

In a saturated air-water vapour mixture, the

A. dry bulb temperature is higher than wet bulb temperature
B. dew point temperature is lower than wet bulb temperature
C. dry bulb, wet bulb and dew point temperature are same
D. dry bulb temperature is higher than dew point temperature

Answer: Option C

Explanation:

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43. 

Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.

A. True
B. False

Answer: Option A

Explanation:

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44. 

The capillary tube is not used in large capacity refrigeration systems because

A. cost is too high
B. capacity control is not possible
C. it is made of copper
D. required pressure drop can not be achieved

Answer: Option B

Explanation:

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45. 

The ratio of emissive power of a body to the emissive power of a perfectly black body is called emissivity.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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